guest: 10% of our students are reached the bench to bench mark in a craig -- in mathematics. look at the highest performing countries -- half of their eighth graders are at the international advanced benchmark. even though our eighth graders, the percentage of high- performance students is well below the very best. host: we see the asian students with many numbers performing at the advanced a level. guest: there is a national movement to put a craters into high school mathematics. that is like algebra and above. you can reuse -- read to this data two ways. there is a need to give them more advanced math but a pessimistic view might be that we are placing a lot of kids in advanced math who are not prepared for it. if our eight craters are performing at this level and have only 7% performing at this level, we don't have a region where naturally prepared for a high-school geometry or mathematics class. host: tell us about your interpretation of the science performance. guest: what is jumping out is look at the #two system. the second highest, the system with the second-highest l